[V8] Audi Engines

[Scott DeWitt]

It's doubtful that a compression ignition gasoline engine will ever be developed. Gasoline doesn't lend itself to be spontaneously ignited in a controlled manner such as a diesel engine. 

Long time ago in the early 90's VW did develop a direct injection gas engine with an absurdly high compression ratio (14:1) however it still had a spark plug.

IIRC one of the more recent incarnations of the BMW V12 used valve lift to control throttle, and netted a substantial gain in engine efficiency, and this was nearly 10 years ago. Mercedes even has a camless engine now, valves are now activated by electric solenoids. 

---- S_Matus <scott_matus at yahoo.com> wrote: 
> I received this Audi Press Release on the New A6 today.  It states it will be offered with 5 engines 2 Gas, 3 Diesels & a Hybrid (future release).
>  
> They are brining out another 2.8L, Hmmm. . . 
>  
> The passage says it does NOT use a throttle if equipped with AVS (I guess this is a step closer to a Compression Ignition Gasoline engine):
>  
> --Snip--
>  
> The naturally aspirated 2.8 FSI is also equipped with AVS; in this case, it acts on the intake valves. The throttle can usually remain open, allowing the V6 to breathe freely. It has an output of 150 kW (204 hp) and achieves 280 Nm (206.52 lb-ft) of torque in the speed range of 5,250 to 6,500 rpm. Key data (with multitronic): 0-100 km/h (0-62.14 mph) in 7.7 seconds; top speed 240 km/h (149.13 mph); consumption in the EU cycle 7.4 liters per 100 km (31.79 US mpg), 172 g CO2 per km (276.81 g/mile). This represents an improvement of 12 percent, despite the fact that the predecessor delivered 10 kW (14 hp) less.
> 
> 
> 
>       
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